121100220161 has 2 divisors, whose sum is σ = 121100220162. Its totient is φ = 121100220160.

The previous prime is 121100220139. The next prime is 121100220209. The reversal of 121100220161 is 161022001121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 72460564225 + 48639655936 = 269185^2 + 220544^2 .

It is a cyclic number.

It is not a de Polignac number, because 121100220161 - 2⁶ = 121100220097 is a prime.

It is not a weakly prime, because it can be changed into another prime (121100220121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60550110080 + 60550110081.

It is an arithmetic number, because the mean of its divisors is an integer number (60550110081).

Almost surely, 2^121100220161 is an apocalyptic number.

It is an amenable number.

121100220161 is a deficient number, since it is larger than the sum of its proper divisors (1).

121100220161 is an equidigital number, since it uses as much as digits as its factorization.

121100220161 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 121100220161 its reverse (161022001121), we get a palindrome (282122221282).

The spelling of 121100220161 in words is "one hundred twenty-one billion, one hundred million, two hundred twenty thousand, one hundred sixty-one".